+ /*
+ * If we're setting an xattr to a new value but the new value is say
+ * exactly BTRFS_MAX_XATTR_SIZE, we could end up with EOVERFLOW getting
+ * back from split_leaf. This is because it thinks we'll be extending
+ * the existing item size, but we're asking for enough space to add the
+ * item itself. So if we get EOVERFLOW just set ret to EEXIST and let
+ * the rest of the function figure it out.
+ */
+ if (ret == -EOVERFLOW)
+ ret = -EEXIST;
+